How Do You Calculate Cannonball Trajectory from a Cliff?

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Homework Help Overview

The discussion revolves around calculating the trajectory of a cannonball fired from a cliff, specifically focusing on the parameters of its launch angle, initial speed, and the height of the cliff. The subject area includes kinematics and projectile motion.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants express uncertainty about how to begin solving the problem and seek guidance rather than direct answers. There is a question regarding the forces acting on the cannonball during its flight, with an initial response identifying gravity as the primary force.

Discussion Status

The discussion is ongoing, with some participants encouraging the formulation of relevant equations and the documentation of attempts. There is an emphasis on understanding the problem setup and the forces involved, but no consensus or resolution has been reached yet.

Contextual Notes

Participants have noted a preference for guidance on problem-solving rather than complete solutions, indicating a focus on learning and understanding the underlying concepts.

Timmy96
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Homework Statement


A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations


What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution


I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.
 
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Timmy96 said:

Homework Statement


A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations


What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution


I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.

What happens to the cannon ball after it is fired; that is, what forces are acting on the ball itself while it is aloft?
 
just gravity
 
Good. Now write down some relevant equations under 2. And show what you have done under 3.
 

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